$(function (){
$("#textAlani").keyup(function (e) { // I selected the textarea and entered my functions inside

    var harfLimiti=140;  // I specified the maximum number of letters to be entered
    var sayac=$(this).val().length; // I defined a variable that will check the 140 letter count above

    $("#girilenHarf").text(sayac) // A small definition to show the entered letters 
    $("#kalanHarf").text(harfLimiti-sayac) // To show the remaining letter count

    if (sayac>harfLimiti) { 
        $("#uyari").text("You cannot enter more letters...")
    }// If the number of letters in the counter exceeds the number in the 'harfLimit' variable,
    // write the text "You cannot enter more letters..." to the selected element using the text property
});

})